He fell in love with boxing in 1990 and began boxing as an amateur. Mariusz competed in 90 amateur fights and represented his country in numerous international tournaments.
His greatest achievements during that period were winning two gold medals and a bronze in the Individual Polish Championships and a silver in the 2004 European Union Championships.
Wach later represented Poland in the 2004 Summer Olympics as an alternate.
Wach turned pro in April 2005 and defeated Deniss Melniks by first round knockout in Swiebodzice, Poland. Wach made his American debut in January of 2006 by defeating Adele Olakanye by decision on the undercard of Arturo Gatti's destruction of Thomas Damgaard at the Boardwalk Hall in Atlantic City, NJ. Wach won seven fights that year, including five in America which was highlighted by winning the Polish International heavyweight title by a ninth round knockout of Arthur Cook in Illinois.
Few months later he won a belt in TWBA federation. In April 2009 in Jaroslaw, Poland Wach blasted out his American opponent Julius Long and defended his title of the World Champion in TWBA.
In 2010, after being sidelined for a year due to injury, Wach returned to the ring in great shape and turned in one of his best performances as a professional, knocking out Christian Hammer in six rounds in Germany.
In September 2010 Wach moved to the United States full time to train at Global Boxing Gym. USA. Now with new trainer and former three-time heavyweight champion Michael Moorer in his corner, Wach has looked better than ever. Their first fight together – against Jonathan Haggler in Newark, NJ – produced explosive results as Wach scored a third round knockout to win the WBC Baltic heavyweight title.
Wach is now promoted by Global Boxing Promotions and Jimmy Burchfield's Classic Entertainment & Sports.
Height and Reach
Good right hand
Mariusz has served as a sparring partner for several well-known boxers, including former heavyweight champion Samuel Peter
Former lineal heavyweight champion Michael Moorer serves as one of Wach's trainers
Wach usually weighs between 248 and 263
KO 4 Kevin McBride - 2011
Served as an alternate for Poland in the 2004 Olympics